const path=require('path')
const HTMLPlugin=require('html-webpack-plugin')
const webpack=require('webpack')
const ExtractPlugin=require('extract-text-webpack-plugin')


const { VueLoaderPlugin } = require('vue-loader')

const isDev=process.env.NODE_ENV === 'development'

const config = {
    target: "web",
    entry:path.join(__dirname,'src/index.js'),
    output:{
        filename: "bundle.[hash:8]js",
        path:path.join(__dirname,'dist')
    },
    module:{
        rules: [
            {
                test:/\.vue$/,
                loader:'vue-loader'
            },
            {
                test:/\.jsx$/,
                loader:'babel-loader'
            },
            {
               test:/\.(gif|jpg|jpeg|png|svg)$/,
                use:[
                    {
                        loader:'url-loader',
                        options: {
                            limit:1024,
                            name:'[name].[ext]'
                        }
                    }
                ]
            }
        ]
    },
    plugins:[
        new webpack.DefinePlugin({
            'process.env':{
                NODE_ENV:isDev ? '"development"' : '"production"'
            }
        }),
        new VueLoaderPlugin(),
        new HTMLPlugin()
    ],
    optimization: {
            splitChunks: {
                chunks: 'initial',
                cacheGroups: {
                    vendors: {
                        test: /[\\/]node_modules[\\/]/,
                        priority: -10
                    }
                }
            }
    }
}


if(isDev){
    config.module.rules.push({
        test:/\.styl/,
            use:[
        'style-loader',
        'css-loader',
        {
            loader:'postcss-loader',
            options: {
                sourceMap:true,
            }
        },
        'stylus-loader'
         ]
    })
    config.devtool='#cheap-module-eval-source-map'
    config.devServer={
        port:8000,
        host:'localhost',
        overlay:{
            errors:true,
        },
        open:true,
        hot:true
    }
    config.plugins.push(
        new webpack.HotModuleReplacementPlugin(),
        new webpack.NoEmitOnErrorsPlugin()
    )
}else{
    config.entry={
        app:path.join(__dirname,'\'src/index.js\''),
        vendor:['vue']
    }
    config.output.filename='[name].[chunkhash:8].js'
    config.module.rules.push({
        test:/\.styl/,
        use:ExtractPlugin.extract({
            fallback:'style-loader',
            use:[
                'css-loader',
                {
                    loader:'postcss-loader',
                    options: {
                        sourceMap:true,
                    }
                },
                'stylus-loader'
            ]
        })
    })
    config.plugins.push(
        new ExtractPlugin('styles.[chunkHash:8].css')
    )

}
module.exports=config

